ArcGIS Pro 2.7 API Reference Guide
OnHidden Method (TOCMapPaneProviderPane)

ArcGIS.Desktop.Mapping Namespace > TOCMapPaneProviderPane Class : OnHidden Method
Notification letting the Pane know it has been hidden.
Syntax
protected override void OnHidden()
Protected Overrides Sub OnHidden() 
Remarks
3rd party panes cannot be hidden. They are always closed
Requirements

Target Platforms: Windows 10, Windows 8.1

See Also

Reference

TOCMapPaneProviderPane Class
TOCMapPaneProviderPane Members